6665161556656 has 20 divisors (see below), whose sum is σ = 13228720042104. Its totient is φ = 3251298320000.

The previous prime is 6665161556629. The next prime is 6665161556659. The reversal of 6665161556656 is 6566551615666.

It is not an unprimeable number, because it can be changed into a prime (6665161556659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5080152970 + ... + 5080154281.

Almost surely, 2^{6665161556656} is an apocalyptic number.

It is an amenable number.

6665161556656 is a deficient number, since it is larger than the sum of its proper divisors (6563558485448).

6665161556656 is a wasteful number, since it uses less digits than its factorization.

6665161556656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10160307300 (or 10160307294 counting only the distinct ones).

The product of its digits is 174960000, while the sum is 64.

The spelling of 6665161556656 in words is "six trillion, six hundred sixty-five billion, one hundred sixty-one million, five hundred fifty-six thousand, six hundred fifty-six".